Safety-crank.



Patented N0vf2, 1 9091 "m fl.

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SAFETY CRANK.

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u n l n V I u m 6 n APPLIOATIN FILED JULY 6, I908. RENEWED SEPT. 20,1909.

UNITED sTAT srnT NT OFFICE.

CARL c. iLG, or NEW YORK. N. Y., ASSIGNOR or ONE-HALF TO FRANCIS NAGY,on NEW YORK, iv. v.

SAFETY-CRANK.

Application filed July 6, 1908, Serial No. 442.092.

vided with devices by which the crank is thrown out of engagement withthe engine shaft whether the engine starts in the direction desired, orin the reverse direction by reason of back fire.

The object of this invention is the production of a safety crank havingspecial construction and particular arrangement of parts, which do notinclude the customary spring pawl and ratchet contrivances that requirethe shaft to be turned for a greater or less distance before engagementoccurs. During the interval necessary for-the ratchet to operate, inthose safety cranks with which I am acquainted, the crank is moved adistance sufficient to greatly endanger the person grasping it when backfire happens.

lt is an object of my invention to provide engaging teeth and pins thatcause the disengaging movement of the crank to begin coincidently withthe increase of speed when the engine starts in the desired direction,or upon the occurrence of contrary rotation resulting from prematureexplosion.

The preferred construction and arrangement of parts constituting andaccomplishing the stated objects, is illustrated in the accompanyingdrawings, of which Figure 1 represents a side view of all partsassembled, and shows the teeth and pins disengaged. Fig. 2 is a sideview of the other side of the invention from that set out in Fig. 1, andshows the teeth and pins engaged. Fig. 4 is a lengthwise section of allparts as illustrated in Fig. 1. Fig. 3 is a side view of the splitsleeve.

Like letters are used to refer to the same parts in the description anddrawings.

Through a suitable bearin A, the end of the engine shaft B passes. Uponthe end of the shaft is placed a sleeve C, which has formed through itnear its outer end the V-slots D and D. At the other end the sleeve C isprovided with notches c, which will be again mentioned. The notches 0have the same form as the apex of the V- Specification of LettersPatent.

Pate ted Nov. 2, 1909.

Renewed September 20, 1909. Serial No. 518,617.

slot D. A ring E. provided with notches c, is secured to the sleeve (1exteriorly, and the notches c are arranged above the notches c in thesleeve as illustrated in Fig. 1.

The crank F is secured to. the outer end of sleeve C, Parallel pins Gand H are passed diametrically through the shaft B, and the ends of thepins project beyond the surface of the shaft as shown.

The outermost part of this mechanism is the splitv sleeve J, having oneor more slots 7', and theannular inwardly projecting portion K. Thesleeve is constructed of elastic metal, and the projecting inward rin Kengages the external groove L encirc ing the sleeve C. The split sleeveJ is secured to a ring M, that is itself secured to the shaft B, and isprovided with the teeth N, best shown in Fig. 2.

The operation of this invention may be explained as follows: Normally,the parts are situated as illustrated in. Fig. 1. That is to say, theprojection K is in engagement with the groove L of the sleeve C. Suchengagement is not tight, but rather loose, in order that the splitsleeve may rotate with the shaft B so long as the engine is working,without undue friction between the part K and the sleeve G. Let it beassumed that the shaft B is brought to rest and it is desired to againcrank the engine. A smart blow delivered by the hand upon the top of thecrank F and in the direction of the axis oft-he shaft will disengage thegroove L and projection K, and will re-arrange the parts bringing theminto the positions shown in Fig. 2. Now, the pin Gr engages the apexesof the V-slots D and D, and the pin H engages the similar notches c inthe inner edge of the cylinder, at the same time the teeth N engage thenotches c of the secured ring R. The operator presses the crank stronglyinwardly, and the various engaged parts enable him to rotate the engineshaft in the direction desired. But, should the engine suddenly startand gain velocity in the desired direction, the shock, for which theoperator is practically unprepared, bringing the pins and teeth againstthe inclined sides of the slots and the notches, throws the crankoutwardly and reengages the projection K and groove, L. Exactly the samemovement takes place when back fire occurs, but rather more quickly, asthe shock is obviously more suddenly operative.

near one end and the said V-slots being i WVhat I claim is.

1. In a safety crank, the combination with the shaft having thediametrically projecting pins, of the sleeve having the V- slots andV-shaped recesses adapted for en E gagement with the pins, a cranksecured to the said sleeve, and means adapted to hold the sleeve movablyupon the shaft and for limiting its out and in movement, substantiallyas described.

2. In a safety crank,the combination with a shaft having thediametrically projecting pins and Wedge-shaped teeth, of the sleevehaving the V-slots and V-shaped recesses, a crank secured to the saidsleeve, and means for guiding and retainin the said sleeve upon theshaft, substantial y as described.

3. In a safety crank, the combination with a shaft having diametricalprojecting pins, of a sleeve having V-slots and V-shaped recessesarranged to engage the pins, the said sleeve having a portion of reduceddiameter presence of two Witnesses.

seeps"? formed in part through the said portion of the sleeve, one ofthe said pins being shorter than the greater internal diameter of thesaid sleeve and adapted to engage the V slots, substantially asdescribed. I

a. In a safety crank, the combination with a shaft having diametricalprojecting pins and Wedge-shaped teeth, of a sleeve having V-slots andV-shaped recesses arranged to engage the said pins and teeth of theshaft, the said sleeve having a portion of reduced diameter near one endand the saidV-slots beingformed in part through said reduced port1on ofthe sleeve, one of the said pins being shorter than the greater internaldiameter of the said sleeve, and adapted to engage the v slots,substantially as described.

In testimony whereof I afiix my signature CARL C. ILG. \Vitnesses:

VERA MoLL'Aon, GEORGE DEFFAA.

